PPL Air Tech - The Engine and Ignition

What is the purpose of the crankshaft?

• To facilitate valve timing

• To convert the movement of the pistons to power at the propeller

• To wind MCL up

• To connect the piston to the camshaft

What is the purpose of the connecting rod?

• To facilitate valve timing

• To convert the movement of the pistons to power at the propeller

• To admit the fuel air mixture to the cylinder

• To connect the piston to the crankshaft

What is the third stroke of a four stroke engine for?

• Combustion

• Intake

• Exhaust

• Compression

What indicates power output in a fixed-pitch propeller?

• manifold pressure

• rpm gauge - but not in a descent

• manifold pressure - but not in a climb

• rpm gauge

What facilitates valve timing?

• crankshaft

• camshaft

• connecting rod

• cylinder

Before the induction stroke what happens with the valves?

• intake valve lead and exhaust valve lag at TDC

• intake valve lag and exhaust valve lead at BDC

• intake valve leads at BDC

• exhaust valve lags at TDC

What are the advantages of a dual ignition system?

• redundancy if one magneto was to fail

• more responsive controls and its safer

• more efficient burning in the cylinder

• more efficient combustion and its safer

When does the spark from the spark plug occur?

• Just after TDC

• Just before TDC

• Just after BDC

• Just before BDC

Which statement is correct?

• An engine would not run from one magneto and one spark plug

• Each cylinder is run by a separate magneto

• There are generally 4 spark plugs per cylinder run from the magnetos

• In one cylinder each spark plug is run by a separate magneto

Where is a distributor located?

• In the spark plug for producing the hottest spark

• In the magneto for allocating energy to the spark plugs

• In the engine for timing of the valves (lead and lag)

• In the starter motor for distributing sparks to the spark plugs